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Market experts have suggested that the Big Six energy firms have not been 'fully candid' about their profit margins, according to reports.

The Big Six face further questions Credit: Press Association

The firms have been accused of misleading consumers over why bills are so high by glossing over the large mark-ups they charge for generating electricity, it has been claimed.

According to The Independent, the industry’s figurehead, Angela Knight, said suppliers worked on margins of just give per cent which were justified to pay for “extremely large” investments necessary in their businesses.

However, the scrapping of green taxes seems to be more popular with the British public, with 47 percent saying that they would prefer to see the taxes scrapped than energy prices frozen, as opposed to 23 percent who didn't.

Energy companies are currently more unpopular than banks and politicians, according to an ITV News poll.

Most respondents said they did not trust the 'Big Six' energy companies. Credit: PA

Seven out of 10 respondents had an "unfavourable" view of their household energy supplier, the worst feedback for any group in a survey that also included journalists, builders and mobile phone networks.